git.sesse.net Git - vlc/blob - modules/codec/libmpeg2.c

   1 /*****************************************************************************
   2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: libmpeg2.c,v 1.20 2003/06/09 00:33:34 massiot Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc/vout.h>
  29 #include <vlc/input.h>
  30 #include <vlc/decoder.h>
  31
  32 #include <stdlib.h>                                      /* malloc(), free() */
  33 #include <string.h>                                    /* memcpy(), memset() */
  34
  35 #include <mpeg2dec/mpeg2.h>
  36
  37 #include "vout_synchro.h"
  38
  39 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  40 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  41 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  42 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  43 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  44
  45 /*****************************************************************************
  46  * dec_thread_t : libmpeg2 decoder thread descriptor
  47  *****************************************************************************/
  48 typedef struct dec_thread_t
  49 {
  50     /*
  51      * libmpeg2 properties
  52      */
  53     mpeg2dec_t          *p_mpeg2dec;
  54     const mpeg2_info_t  *p_info;
  55     vlc_bool_t          b_skip;
  56
  57     /*
  58      * Input properties
  59      */
  60     decoder_fifo_t   *p_fifo;                  /* stores the PES stream data */
  61     pes_packet_t     *p_pes;                  /* current PES we are decoding */
  62     mtime_t          i_pts;
  63     mtime_t          i_previous_pts;
  64     mtime_t          i_current_pts;
  65     mtime_t          i_period_remainder;
  66     int              i_current_rate;
  67     picture_t *      p_picture_to_destroy;
  68     vlc_bool_t       b_garbage_pic;
  69     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
  70                                                * the sequence header ?    */
  71     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
  72
  73     /*
  74      * Output properties
  75      */
  76     vout_thread_t *p_vout;
  77     vout_synchro_t *p_synchro;
  78
  79 } dec_thread_t;
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static int  OpenDecoder  ( vlc_object_t * );
  85 static int  RunDecoder   ( decoder_fifo_t * );
  86 static void CloseDecoder ( dec_thread_t * );
  87
  88 static picture_t *GetNewPicture( dec_thread_t *, uint8_t ** );
  89
  90 /*****************************************************************************
  91  * Module descriptor
  92  *****************************************************************************/
  93 vlc_module_begin();
  94     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
  95     set_capability( "decoder", 40 );
  96     set_callbacks( OpenDecoder, NULL );
  97     add_shortcut( "libmpeg2" );
  98 vlc_module_end();
  99
 100 /*****************************************************************************
 101  * OpenDecoder: probe the decoder and return score
 102  *****************************************************************************/
 103 static int OpenDecoder( vlc_object_t *p_this )
 104 {
 105     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
 106
 107     if( p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') )
 108     {
 109         return VLC_EGENERIC;
 110     }
 111
 112     p_fifo->pf_run = RunDecoder;
 113     return VLC_SUCCESS;
 114 }
 115
 116 /*****************************************************************************
 117  * RunDecoder: the libmpeg2 decoder
 118  *****************************************************************************/
 119 static int RunDecoder( decoder_fifo_t *p_fifo )
 120 {
 121     dec_thread_t    *p_dec;
 122     data_packet_t   *p_data = NULL;
 123     mpeg2_state_t   state;
 124     picture_t       *p_pic;
 125     int             i_aspect, i_chroma;
 126
 127     /* Allocate the memory needed to store the thread's structure */
 128     if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) )
 129         == NULL)
 130     {
 131         msg_Err( p_fifo, "out of memory" );
 132         goto error;
 133     }
 134
 135     /* Initialize the thread properties */
 136     memset( p_dec, 0, sizeof(dec_thread_t) );
 137     p_dec->p_fifo     = p_fifo;
 138     p_dec->p_pes      = NULL;
 139     p_dec->p_vout     = NULL;
 140     p_dec->p_mpeg2dec = NULL;
 141     p_dec->p_synchro  = NULL;
 142     p_dec->p_info     = NULL;
 143     p_dec->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 144     p_dec->i_current_pts  = 0;
 145     p_dec->i_previous_pts = 0;
 146     p_dec->i_period_remainder = 0;
 147     p_dec->p_picture_to_destroy = NULL;
 148     p_dec->b_garbage_pic = 0;
 149     p_dec->b_slice_i  = 0;
 150     p_dec->b_skip     = 0;
 151
 152     /* Initialize decoder */
 153     p_dec->p_mpeg2dec = mpeg2_init();
 154     if( p_dec->p_mpeg2dec == NULL)
 155         goto error;
 156
 157     p_dec->p_info = mpeg2_info( p_dec->p_mpeg2dec );
 158
 159     /* libmpeg2 decoder thread's main loop */
 160     while( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
 161     {
 162         state = mpeg2_parse( p_dec->p_mpeg2dec );
 163
 164         switch( state )
 165         {
 166         case STATE_BUFFER:
 167             /* Feed libmpeg2 a data packet at a time */
 168             if( p_data == NULL )
 169             {
 170                 /* Get the next PES */
 171                 if( p_dec->p_pes )
 172                     input_DeletePES( p_dec->p_fifo->p_packets_mgt,
 173                                      p_dec->p_pes );
 174
 175                 input_ExtractPES( p_dec->p_fifo, &p_dec->p_pes );
 176                 if( !p_dec->p_pes )
 177                 {
 178                     p_dec->p_fifo->b_error = 1;
 179                     break;
 180                 }
 181
 182                 if( p_dec->p_pes->b_discontinuity && p_dec->p_synchro )
 183                 {
 184                     vout_SynchroReset( p_dec->p_synchro );
 185                     if ( p_dec->p_info->current_fbuf != NULL )
 186                     {
 187                         p_dec->b_garbage_pic = 1;
 188                         p_pic = p_dec->p_info->current_fbuf->id;
 189                     }
 190                     else
 191                     {
 192                         uint8_t *buf[3];
 193                         buf[0] = buf[1] = buf[2] = NULL;
 194                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 195                             break;
 196                         mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 197                     }
 198                     p_dec->p_picture_to_destroy = p_pic;
 199
 200                     memset( p_pic->p[0].p_pixels, 0,
 201                             p_dec->p_info->sequence->width
 202                              * p_dec->p_info->sequence->height );
 203                     memset( p_pic->p[1].p_pixels, 0x80,
 204                             p_dec->p_info->sequence->width
 205                              * p_dec->p_info->sequence->height / 4 );
 206                     memset( p_pic->p[2].p_pixels, 0x80,
 207                             p_dec->p_info->sequence->width
 208                              * p_dec->p_info->sequence->height / 4 );
 209
 210                     if ( p_dec->b_slice_i )
 211                     {
 212                         vout_SynchroNewPicture( p_dec->p_synchro,
 213                             I_CODING_TYPE, 2, 0, 0, p_dec->i_current_rate );
 214                         vout_SynchroDecode( p_dec->p_synchro );
 215                         vout_SynchroEnd( p_dec->p_synchro, I_CODING_TYPE, 0 );
 216                     }
 217                 }
 218
 219                 if( p_dec->p_pes->i_pts )
 220                 {
 221                     mpeg2_pts( p_dec->p_mpeg2dec,
 222                                (uint32_t)p_dec->p_pes->i_pts );
 223                     p_dec->i_previous_pts = p_dec->i_current_pts;
 224                     p_dec->i_current_pts = p_dec->p_pes->i_pts;
 225                 }
 226
 227                 p_dec->i_current_rate = p_dec->p_pes->i_rate;
 228                 p_data = p_dec->p_pes->p_first;
 229             }
 230
 231             if( p_data != NULL )
 232             {
 233                 mpeg2_buffer( p_dec->p_mpeg2dec,
 234                               p_data->p_payload_start,
 235                               p_data->p_payload_end );
 236
 237                 p_data = p_data->p_next;
 238             }
 239             break;
 240
 241         case STATE_SEQUENCE:
 242         {
 243             /* Initialize video output */
 244             uint8_t *buf[3];
 245             buf[0] = buf[1] = buf[2] = NULL;
 246
 247             /* Check whether the input gives a particular aspect ratio */
 248             if( p_dec->p_fifo->p_demux_data
 249                 && ( *(int*)(p_dec->p_fifo->p_demux_data) & 0x7 ) )
 250             {
 251                 i_aspect = *(int*)(p_dec->p_fifo->p_demux_data);
 252                 switch( i_aspect )
 253                 {
 254                 case AR_3_4_PICTURE:
 255                     i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 256                     break;
 257                 case AR_16_9_PICTURE:
 258                     i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 259                     break;
 260                 case AR_221_1_PICTURE:
 261                     i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 262                     break;
 263                 case AR_SQUARE_PICTURE:
 264                 default:
 265                     i_aspect = VOUT_ASPECT_FACTOR *
 266                                    p_dec->p_info->sequence->width /
 267                                    p_dec->p_info->sequence->height;
 268                     break;
 269                 }
 270             }
 271             else
 272             {
 273                 /* Use the value provided in the MPEG sequence header */
 274                 i_aspect = ((uint64_t)p_dec->p_info->sequence->display_width) *
 275                     p_dec->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
 276                     p_dec->p_info->sequence->display_height /
 277                     p_dec->p_info->sequence->pixel_height;
 278             }
 279
 280             i_chroma = VLC_FOURCC('Y','V','1','2');
 281
 282             p_dec->p_vout = vout_Request( p_dec->p_fifo, p_dec->p_vout,
 283                                           p_dec->p_info->sequence->width,
 284                                           p_dec->p_info->sequence->height,
 285                                           i_chroma, i_aspect );
 286
 287             msg_Dbg( p_dec->p_fifo, "%dx%d, aspect %d, %u.%03u fps",
 288                      p_dec->p_info->sequence->width,
 289                      p_dec->p_info->sequence->height, i_aspect,
 290                      (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period / 1001),
 291                      (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period % 1001) );
 292
 293             mpeg2_custom_fbuf( p_dec->p_mpeg2dec, 1 );
 294
 295             /* Set the first 2 reference frames */
 296             mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL );
 297
 298             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 299             memset( p_pic->p[0].p_pixels, 0,
 300                     p_dec->p_info->sequence->width
 301                      * p_dec->p_info->sequence->height );
 302             memset( p_pic->p[1].p_pixels, 0x80,
 303                     p_dec->p_info->sequence->width
 304                      * p_dec->p_info->sequence->height / 4 );
 305             memset( p_pic->p[2].p_pixels, 0x80,
 306                     p_dec->p_info->sequence->width
 307                      * p_dec->p_info->sequence->height / 4 );
 308             mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 309             /* This picture will never go through display_picture. */
 310             vout_DatePicture( p_dec->p_vout, p_pic, 0 );
 311             vout_DisplayPicture( p_dec->p_vout, p_pic );
 312             /* For some reason, libmpeg2 will put this pic twice in
 313              * discard_picture. This can be considered a bug in libmpeg2. */
 314             vout_LinkPicture( p_dec->p_vout, p_pic );
 315
 316             if ( p_dec->p_synchro )
 317             {
 318                 vout_SynchroRelease( p_dec->p_synchro );
 319             }
 320             p_dec->p_synchro = vout_SynchroInit( p_dec->p_fifo, p_dec->p_vout,
 321                 (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period) );
 322             p_dec->b_after_sequence_header = 1;
 323         }
 324         break;
 325
 326         case STATE_PICTURE_2ND:
 327             vout_SynchroNewPicture( p_dec->p_synchro,
 328                 p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 329                 p_dec->p_info->current_picture->nb_fields,
 330                 0, 0,
 331                 p_dec->i_current_rate );
 332
 333             if ( p_dec->b_skip )
 334             {
 335                 vout_SynchroTrash( p_dec->p_synchro );
 336             }
 337             else
 338             {
 339                 vout_SynchroDecode( p_dec->p_synchro );
 340             }
 341             break;
 342
 343         case STATE_PICTURE:
 344         {
 345             uint8_t *buf[3];
 346             buf[0] = buf[1] = buf[2] = NULL;
 347
 348             if ( p_dec->b_after_sequence_header
 349                   && ((p_dec->p_info->current_picture->flags
 350                         & PIC_MASK_CODING_TYPE)
 351                        == PIC_FLAG_CODING_TYPE_P) )
 352             {
 353                 /* Intra-slice refresh. Simulate a blank I picture. */
 354                 msg_Dbg( p_dec->p_fifo, "intra-slice refresh stream" );
 355                 vout_SynchroNewPicture( p_dec->p_synchro,
 356                     I_CODING_TYPE, 2, 0, 0, p_dec->i_current_rate );
 357                 vout_SynchroDecode( p_dec->p_synchro );
 358                 vout_SynchroEnd( p_dec->p_synchro, I_CODING_TYPE, 0 );
 359                 p_dec->b_slice_i = 1;
 360             }
 361             p_dec->b_after_sequence_header = 0;
 362
 363             vout_SynchroNewPicture( p_dec->p_synchro,
 364                 p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 365                 p_dec->p_info->current_picture->nb_fields,
 366                 (p_dec->p_info->current_picture->flags & PIC_FLAG_PTS) ?
 367                     ( (p_dec->p_info->current_picture->pts ==
 368                                 (uint32_t)p_dec->i_current_pts) ?
 369                               p_dec->i_current_pts : p_dec->i_previous_pts ) : 0,
 370                 0,
 371                 p_dec->i_current_rate );
 372
 373             if ( !(p_dec->b_slice_i
 374                    && ((p_dec->p_info->current_picture->flags
 375                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 376                    && !vout_SynchroChoose( p_dec->p_synchro,
 377                               p_dec->p_info->current_picture->flags
 378                                 & PIC_MASK_CODING_TYPE ) )
 379             {
 380                 mpeg2_skip( p_dec->p_mpeg2dec, 1 );
 381                 p_dec->b_skip = 1;
 382                 vout_SynchroTrash( p_dec->p_synchro );
 383                 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL );
 384             }
 385             else
 386             {
 387                 mpeg2_skip( p_dec->p_mpeg2dec, 0 );
 388                 p_dec->b_skip = 0;
 389                 vout_SynchroDecode( p_dec->p_synchro );
 390                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 391                 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 392             }
 393         }
 394         break;
 395
 396         case STATE_END:
 397         case STATE_SLICE:
 398             if( p_dec->p_info->display_fbuf
 399                 && p_dec->p_info->display_fbuf->id )
 400             {
 401                 p_pic = (picture_t *)p_dec->p_info->display_fbuf->id;
 402
 403                 vout_SynchroEnd( p_dec->p_synchro,
 404                             p_dec->p_info->display_picture->flags
 405                              & PIC_MASK_CODING_TYPE,
 406                             p_dec->b_garbage_pic );
 407                 p_dec->b_garbage_pic = 0;
 408                 vout_DisplayPicture( p_dec->p_vout, p_pic );
 409
 410                 if ( p_dec->p_picture_to_destroy != p_pic )
 411                 {
 412                     vout_DatePicture( p_dec->p_vout, p_pic,
 413                         vout_SynchroDate( p_dec->p_synchro ) );
 414                 }
 415                 else
 416                 {
 417                     p_dec->p_picture_to_destroy = NULL;
 418                     vout_DatePicture( p_dec->p_vout, p_pic, 0 );
 419                 }
 420             }
 421
 422             if( p_dec->p_info->discard_fbuf &&
 423                 p_dec->p_info->discard_fbuf->id )
 424             {
 425                 p_pic = (picture_t *)p_dec->p_info->discard_fbuf->id;
 426                 vout_UnlinkPicture( p_dec->p_vout, p_pic );
 427             }
 428             break;
 429
 430         case STATE_INVALID:
 431         {
 432             uint8_t *buf[3];
 433             buf[0] = buf[1] = buf[2] = NULL;
 434
 435             msg_Warn( p_dec->p_fifo, "invalid picture encountered" );
 436             if ( ( p_dec->p_info->current_picture == NULL ) ||
 437                ( ( p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE)
 438                   != B_CODING_TYPE ) )
 439             {
 440                 vout_SynchroReset( p_dec->p_synchro );
 441             }
 442             mpeg2_skip( p_dec->p_mpeg2dec, 1 );
 443             p_dec->b_skip = 1;
 444
 445             if( p_dec->p_info->current_fbuf &&
 446                 p_dec->p_info->current_fbuf->id )
 447             {
 448                 p_dec->b_garbage_pic = 1;
 449                 p_pic = p_dec->p_info->current_fbuf->id;
 450             }
 451             else
 452             {
 453                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 454                     break;
 455                 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 456             }
 457             p_dec->p_picture_to_destroy = p_pic;
 458
 459             memset( p_pic->p[0].p_pixels, 0,
 460                     p_dec->p_info->sequence->width
 461                      * p_dec->p_info->sequence->height );
 462             memset( p_pic->p[1].p_pixels, 0x80,
 463                     p_dec->p_info->sequence->width
 464                      * p_dec->p_info->sequence->height / 4 );
 465             memset( p_pic->p[2].p_pixels, 0x80,
 466                     p_dec->p_info->sequence->width
 467                      * p_dec->p_info->sequence->height / 4 );
 468
 469             if ( p_dec->b_slice_i )
 470             {
 471                 vout_SynchroNewPicture( p_dec->p_synchro,
 472                             I_CODING_TYPE, 2, 0, 0, p_dec->i_current_rate );
 473                 vout_SynchroDecode( p_dec->p_synchro );
 474                 vout_SynchroEnd( p_dec->p_synchro, I_CODING_TYPE, 0 );
 475             }
 476             break;
 477         }
 478
 479         default:
 480             break;
 481         }
 482     }
 483
 484     /* If b_error is set, the libmpeg2 decoder thread enters the error loop */
 485     if( p_dec->p_fifo->b_error )
 486     {
 487         DecoderError( p_dec->p_fifo );
 488     }
 489
 490     /* End of the libmpeg2 decoder thread */
 491     CloseDecoder( p_dec );
 492
 493     return 0;
 494
 495  error:
 496     DecoderError( p_fifo );
 497     if( p_dec )
 498     {
 499         if( p_dec->p_fifo )
 500             p_dec->p_fifo->b_error = 1;
 501
 502         /* End of the libmpeg2 decoder thread */
 503         CloseDecoder( p_dec );
 504     }
 505
 506     return -1;
 507 }
 508
 509 /*****************************************************************************
 510  * CloseDecoder: libmpeg2 decoder destruction
 511  *****************************************************************************/
 512 static void CloseDecoder( dec_thread_t * p_dec )
 513 {
 514     if( p_dec )
 515     {
 516         int i_pic;
 517
 518         if( p_dec->p_pes )
 519             input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes );
 520
 521         if( p_dec->p_synchro )
 522             vout_SynchroRelease( p_dec->p_synchro );
 523
 524         if( p_dec->p_vout )
 525         {
 526             /* Temporary hack to free the pictures in use by libmpeg2 */
 527             for( i_pic = 0; i_pic < p_dec->p_vout->render.i_pictures; i_pic++ )
 528             {
 529                 if( p_dec->p_vout->render.pp_picture[i_pic]->i_status ==
 530                       RESERVED_PICTURE )
 531                     vout_DestroyPicture( p_dec->p_vout,
 532                                      p_dec->p_vout->render.pp_picture[i_pic] );
 533                 if( p_dec->p_vout->render.pp_picture[i_pic]->i_refcount > 0 )
 534                     vout_UnlinkPicture( p_dec->p_vout,
 535                                      p_dec->p_vout->render.pp_picture[i_pic] );
 536             }
 537
 538             vout_Request( p_dec->p_fifo, p_dec->p_vout, 0, 0, 0, 0 );
 539         }
 540
 541         if( p_dec->p_mpeg2dec ) mpeg2_close( p_dec->p_mpeg2dec );
 542
 543         free( p_dec );
 544     }
 545 }
 546
 547 /*****************************************************************************
 548  * GetNewPicture: Get a new picture from the vout and set the buf struct
 549  *****************************************************************************/
 550 static picture_t *GetNewPicture( dec_thread_t *p_dec, uint8_t **pp_buf )
 551 {
 552     picture_t *p_pic;
 553     vlc_bool_t b_progressive = p_dec->p_info->current_picture != NULL ?
 554         p_dec->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME :
 555         1;
 556     vlc_bool_t b_top_field_first = p_dec->p_info->current_picture != NULL ?
 557         p_dec->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST :
 558         1;
 559     unsigned int i_nb_fields = p_dec->p_info->current_picture != NULL ?
 560         p_dec->p_info->current_picture->nb_fields : 2;
 561
 562     /* Get a new picture */
 563     while( !(p_pic = vout_CreatePicture( p_dec->p_vout,
 564         b_progressive, b_top_field_first, i_nb_fields )) )
 565     {
 566         if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
 567             break;
 568
 569         msleep( VOUT_OUTMEM_SLEEP );
 570     }
 571     if( p_pic == NULL )
 572         return NULL;
 573     vout_LinkPicture( p_dec->p_vout, p_pic );
 574
 575     pp_buf[0] = p_pic->p[0].p_pixels;
 576     pp_buf[1] = p_pic->p[1].p_pixels;
 577     pp_buf[2] = p_pic->p[2].p_pixels;
 578
 579     return p_pic;
 580 }